Novel key parameter for eutectic nitrates based nanofluids selection for concentrating solar power (CSP) systems

Zhu, Jianhua; Palacios, Anabel; Lei, Xianzhang; Navarro, María Elena; Qiao, Gang; Mura, Ernesto; Xu, Guizhi; Ding, Yulong

doi:10.1016/j.apenergy.2018.10.114

Cited by 37 publications

(12 citation statements)

References 47 publications

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“…Previous studies have been reported the enhanced specific heat capacity of a molten salt eutectic adding nanoparticles [17,[18][19][20][21][22][23][24][25][26][27][28][29][30][31]. Different types of a molten salt eutectic adding nanoparticles were prepared to measure its specific heat capacity in several studies [17]. These studies reported types of a molten salt eutectic, types of nanoparticles, concentration percent of nanoparticles, synthesis procedure, measurement techniques, enhancement, and nanoparticles' diameter and shape.…”

Section: Introductionmentioning

confidence: 99%

WITHDRAWN: A Novel Method for the Synthesis of Binary Molten Salt Nanofluids Adding SiO2 Nanoparticles

Seo

2020

Preprint

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In this study, the new method has been suggested for the synthesis of a binary molten salt eutectic adding nanoparticles (i.e. molten salt nanofluids). Solar salt (i.e. NaNO 3 -KNO 3 , 60:40 by weight) adding 10nm of SiO 2 nanoparticles was prepared to measure the specific heat capacity of molten salt nanofluids by a modulated differential scanning calorimeter (MDSC). In previous studies the sample preparation of a molten salt eutectic follows the same procedure. Each chemical of a molten salt eutectic and nanoparticles is dissolved in an aqueous solution. These homogeneous salts are completely mixed by a sonication. Nano-mixtures are scrapped off the bottom surface of a vial after drying. However, there are complex steps in the process of getting fresh molten salt eutectic nanofluids before MDSC measurements. An unexpected result is able to occur due to phase change (i.e. solid-liquid-solid) at each step and then it has an affect on the specific heat capacity of molten salt nanofluids. A suggested novel method (i.e. Liquid-to-Liquid) can not only prevent unexpected errors (e.g. the possibility of contamination) by phase change in the sample preparation, but also enhance the specific heat capacity of molten salt nanofluids.

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Section: Introductionmentioning

confidence: 99%

WITHDRAWN: A Novel Method for the Synthesis of Binary Molten Salt Nanofluids Adding SiO2 Nanoparticles

Seo

2020

Preprint

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“…Therefore to assess the performance of NFs, Mouromtseff 71 presented performance criteria of NFs under turbulent regime based on thermal conductivity ( k ), viscosity ( μ ), density ( ρ ) and specific heat capacity ( C P ) of NFs as shown in Equation (6). Also for the turbulent flow conditions, empirical correlation between viscosity and PP has been employed 72 as shown in Equation (). Whereas, Prasher et al 73 purposed a merit criterion for laminar flow conditions based on the thermal conductivity ( k ) and viscosity ( μ ) as in Equation (9).…”

Section: Performance Estimation Of Nfsmentioning

confidence: 99%

Thermal conductivity, rheology and stability analysis of 2D tungsten disulphide‐doped polyaniline‐based nanofluids: An experimental investigation

et al. 2020

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Summary In this study, polyaniline (PANI) nanocomposite‐based nanofluids (NFs) in ethylene glycol were obtained with a two‐step method by varying volume concentrations from 0.005% to 0.02%. Tungsten disulphide (WS2) nanoparticles were doped in PANI having different weight percentage (1%, 2% and 5%) via oxidative in situ polymerization employing ammonium persulphate oxidant in an acidic environment. The nanocomposites were comprehensively characterised using various techniques, such as Fourier transform infrared spectroscopy, thermogravimetric analysis, field emission scanning electron microscopy and high‐resolution transmission electron microscopy. The formulated NFs were extensively investigated with zeta‐sizer, particle size analyzer, thermal property analyzer and rheometer in a temperature range of 25°C to 70°C. The zeta potential results (up to 54.5 mV) were evident of extraordinary stability of NFs at all targeted temperatures along with polydispersity index <30% and mean particle/agglomerate size in the range of 335.8 to 489 nm. Additionally, a remarkable thermal conductivity improvement (~20.7%) was achieved with intrinsic PANI‐based NFs at an operating temperature of 50°C. Subsequently, it varied substantially with WS2 doping within PANI matrix and reached to 117.9%. Furthermore, the rheological measurements have revealed the viscoelastic nature of NFs along with a remarkable reduction in apparent viscosity (up to 8.4%). The temperature sweep viscosity indicated the transition of relative viscosity from high to low at a critical temperature of about 55°C. The NF10 (WS2 + PANI 5, at 0.005 vol%) was found to be the best candidate with 63.8% thermal conductivity enhancement and 6.4% viscosity reduction as compared with the base fluid at an operating temperature of 50°C. Thus, WS2 doping within PANI has proved to be crucial in the proliferation of thermal conductivity and mitigation of viscosity.

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“…Nevertheless, the percentage of nanoparticles into a base fluid in volume percentage will determine the stability and suspension of the nanofluid and the improvement of thermal properties [6,7].…”

Section: Introductionmentioning

confidence: 99%

MXene based new class of silicone oil nanofluids for the performance improvement of concentrated photovoltaic thermal collector

Aslfattahi

Samylingam

Abdelrazik

et al. 2020

Solar Energy Materials and Solar Cells

102

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In this research work, MXene with a chemical formula of Ti3C2 is used for the first time with silicone oil to improve thermo-physical properties of MXene based silicone oil. This paper focuses on preparation, characterization, thermal properties, thermal stability and performance investigation of new class of silicone oil nanofluids induced with MXene in three different concentrations for a Concentrated Solar Photovoltaic Thermal (CPVT) collector.The thermal conductivity of the silicone oil-based MXene nanofluids is measured using a Transient Hot Bridge (THB) 500. Viscosity is measured using a Rheometer at various temperatures including 25, 50, 75, 100, and 125 °C. Perkin Elmer Lambda 750 is used to measure optical absorbance. The highest thermal conductivity enhancement is found to be 64% for 0.1 wt.% concentration of silicone oil-MXene nanofluid compared to pure silicone oil at 150 °C. The viscosity of MXene with silicone oil nanofluids is found to be independent of addition of MXene nanoparticles in the silicone oil base fluid. Viscosity is reduced by 37% when temperature is raised from 25 ºC to 50 ºC for different concentrations of MXene with silicone oil . Silicone oil-based MXene nanofluid with 0.1 wt.% concentration is thermally stable up to ~ 380 °C. Introducing more MXene nanoparticles into silicone oil improves electrical efficiency of PV module due to better cooling of MXene based nanofluids. Higher solar concentration is resulted in higher average temperature of the PV module. This consequently raises thermal energy gain which is useful for different applications.

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Novel key parameter for eutectic nitrates based nanofluids selection for concentrating solar power (CSP) systems

Cited by 37 publications

References 47 publications

WITHDRAWN: A Novel Method for the Synthesis of Binary Molten Salt Nanofluids Adding SiO2 Nanoparticles

WITHDRAWN: A Novel Method for the Synthesis of Binary Molten Salt Nanofluids Adding SiO2 Nanoparticles

Thermal conductivity, rheology and stability analysis of 2D tungsten disulphide‐doped polyaniline‐based nanofluids: An experimental investigation

MXene based new class of silicone oil nanofluids for the performance improvement of concentrated photovoltaic thermal collector

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